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Histogram double-control infrared image contrast enhancement method

An infrared image and histogram technology, applied in the field of infrared image and video processing, can solve the problems of loss of details, non-adaptive parameters, etc., achieve good contrast enhancement effect, flexible control mode, and increase flexibility

Active Publication Date: 2020-05-08
HUAQIAO UNIVERSITY
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Problems solved by technology

[0004] The present invention provides a histogram dual-control infrared image contrast enhancement method, which is used to solve the loss of details and non-adaptive parameters in the existing infrared image contrast enhancement method and other deficiencies, making the contrast enhancement process simple and effective

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  • Histogram double-control infrared image contrast enhancement method

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[0025] Such as figure 1 As shown in the process, the present invention is a method for enhancing the contrast of an infrared image with dual control of histograms, including: performing mean value normalization preprocessing on the histogram; calculating the proportion of effective gray levels in the histogram; The histogram truncation threshold and the correction parameter Gamma value are obtained by calculating the ratio; the threshold is used to clamp the histogram; part of the histogram data is subjected to Gamma correction processing; the histogram data is post-processed and adjusted.

[0026] The present invention will be further described below through specific embodiments.

[0027] S1: Perform mean normalization processing on the histogram;

[0028] First, read the 8bit infrared image grayscale image Iin, such as figure 2 , if the input image is an infrared image in RGB, HIS, YUV and other color spaces, then the grayscale image of the infrared image is obtained acco...

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Abstract

The invention discloses a histogram double-control infrared image contrast enhancement method, and the technical scheme comprises the steps: firstly carrying out the mean normalization preprocessing of a histogram, and then calculating the proportion of effective gray levels in the histogram; setting a histogram truncation threshold value according to the effective gray scale proportion, wherein the truncation threshold value is directly proportional to the proportion value, and numerical protection processing is carried out; solving a correction parameter Gamma value, wherein the Gamma valueis inversely proportional to the truncation threshold; performing clamping processing on the histogram, and then performing Gamma correction processing on part of data; and performing post-processingon the histogram data and performing classic histogram equalization operation, and finally outputting an infrared image with enhanced contrast. The histogram of the whole image needs to be counted; other operations adopt a point processing algorithm; therefore, the processing efficiency is high, few resources are occupied; the real-time performance is good; the method is simple in calculation, direct processing of histograms. Compared with the prior art, operation and internal self-adaptive control on each pixel point of each image are not needed, a better contrast enhancement effect can be achieved by adopting default parameters, the control mode is flexible, and manual control parameters can be set according to personal visual perception differences, so that sensory requirements of different users are met, and the flexibility of the algorithm is improved.

Description

technical field [0001] The invention belongs to the field of infrared image and video processing, in particular to a method for enhancing the contrast of an infrared image with dual control of histograms. Background technique [0002] Affected by the accuracy of different infrared shooting equipment, the collected infrared images have insufficient contrast, the target is not obvious, and the visual perception effect is not good. Therefore, contrast enhancement is a basic image processing technology in the field of infrared image processing. [0003] The existing infrared contrast enhancement methods can be divided into two types according to the adjustment objects. One type of method is to directly adjust the pixel points of the image, such as directly correcting the pixel points of the image by using the Gamma value. The disadvantage of this type of method is that the global correction parameter Gamma is one value, and the enhancement effect of some areas of the image is i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/136
CPCG06T7/136G06T5/92
Inventor 戴声奎陈翔程张超高剑萍
Owner HUAQIAO UNIVERSITY
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